fix: repair the image gallery sort control

[ihor-romaniuk]

Description

The "Add an image" gallery in the rich-text editors has two problems with its sort control.

Its label reads Bynewest — the space between the "By" prefix and the sort option is missing, so every option renders as Byoldest, ByName A-Z and so on. The label now reads "By newest" again.

Opening that control made the whole modal scroll sideways: the menu is wider than the button it hangs from, so it spilled past the modal's right edge and the modal grew a horizontal scrollbar. The menu now stays inside the modal and the scrollbar is gone.

Both apply to the video gallery too, which uses the same control.

Implementation notes

• The space was a literal JSX text node in SearchSort.jsx. dprint strips those between elements, and it did so in Use "dprint" as a code formatter, replacing eslint #2997 when it replaced eslint — running dprint fmt on the restored literal removes it again. {' '} survives formatting.
• The existing SearchSort tests already match on By oldest, but that is the accessible name, and the accname algorithm space-joins text across element boundaries, so they read "By oldest" from markup that displays "Byoldest". The new test asserts the rendered text instead.
• SelectMenu hard-codes placement="bottom-start" and exposes no alignment prop, and its menu is --pgn-size-menu-item-width-base, 19rem, against a toggle of about 9rem. Measured in the running Studio: the menu ran to x=1258 while the modal ended at x=1120, and the modal's scrollWidth exceeded its clientWidth by 138px.
• The popper wrapper carries the placement inline, so overriding it needs !important. Popper's own transform stays 0,0 here, so the menu simply anchors to the toggle's other edge.

Screenshot/Video

Before	After

Testing

1. In Studio, open any Problem component for editing — for example a Single select.
2. In the Question toolbar, click the image button. The "Add an image" modal opens.
3. Expected: the control in the top right reads "By newest". Before this change it read "Bynewest".
4. Click it to open the sort menu.
5. Expected: the menu stays inside the modal and no horizontal scrollbar appears along the bottom of the modal. Before this change the menu hung past the modal's right edge and the modal scrolled sideways.
6. Pick each option in turn — Oldest, Name A-Z, Name Z-A, Shortest, Longest.
7. Expected: the label reads "By oldest", "By Name A-Z" and so on, and the gallery reorders.
8. Repeat from a Text component and from a course custom page.
9. Expected: the same.
10. Add a Video component to a unit so the video gallery opens.
11. Expected: the same sort control, also with a space and also contained. Its filter dropdown and the "Show only my videos" switch are unchanged.

Verified locally

Check	Result
Sort label in a running Studio	"By newest"; the button's text content went from Bynewest to By newest
Menu geometry with the menu open	menu 772–1076 against a modal of 320–1120; before the fix 954–1258
Modal overflow	scrollWidth - clientWidth went from 138px to 0; no element in the modal reports a horizontal scrollbar
Toggle placed mid-row, as in the video gallery	menu 462–766 inside a body of 174–1266, still no overflow
dprint fmt on the restored literal space	strips it again; {' '} survives — this is why the fix takes that form
New test red/green	fails with Bynewest, passes after; the four existing tests pass either way
jest on SelectionModal, ImageUploadModal, VideoGallery	14 suites, 168 tests
npm run lint, tsc --noEmit	clean
Not verified	The video gallery was not opened in the browser — adding a Video component creates a block in the course. Its layout was checked by placing the sort toggle mid-row in the image gallery, which is the same component with the same neighbours.

[openedx-webhooks]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.92%. Comparing base (16e19f1) to head (8d7aaa0).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3219   +/-   ##
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  Coverage   95.92%   95.92%           
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  Files        1397     1397           
  Lines       33581    33581           
  Branches     7947     7947           
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  Hits        32214    32214           
  Misses       1308     1308           
  Partials       59       59           

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